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    Expected Value, variance and standard deviation

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    The number of customers waiting at any given time is described in the table below.

    # of Customers X 1 2 3 4 5
    Probability P(X) 0.15 0.32 0.28 0.15 0.10

    Compute the expectation E(X), the variance, and the standard deviation.

    Please show me calculations on how it's done without using an advanced calculator. Thank you.

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    https://brainmass.com/statistics/distribution-of-data/expected-value-variance-standard-deviation-252452

    Solution Preview

    The number of customers waiting at any given time is described in the table below.

    # of Customers X 1 2 3 4 5
    Probability P(X) 0.15 0.32 0.28 0.15 0.10

    Please see the attached ...

    Solution Summary

    The expert computes the expected value, the variance, and the standard deviation for a probability distribution.

    $2.19

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